I remember in Wolfman's New Teen Titans run there was mention that men could not step foot on Themyscira or something bad would happen. I think when the Amazons were healing Beast Boy with that purple ray on the island they made sure his feet never actually touched the ground. What was the consequence for men touching feet on the island back in that point in time?

The chief consequence held was that the event of a man setting foot on the island would cancel the Amazons immortality and powers and end the way of life of which they had retired to on Paradise Island. These conditions were set by their patron and founder Aphrodite and formed a contract of sorts, one that combined with the Amazons longstanding wariness of man to virtually guarantee a place which would be forever apart from the world yet able to practice peace and learning over War and conflict.

One story in particular addresses the subject head on, Wonder Woman #216, and sees a story told that appears to be revealing the truth of the matter is that it isn't so much a literal apocalypse that would consume the island and Amazons but their society compelled to tear itself apart in lust over the man who sets foot on the island. Aphrodite's "cosmic Joke" as Queen Hippolyta puts it. It's not an explanation that makes complete sense if you think on it, and the story is possibly apocryphal given it was never referred to again, but the clever point to that tale is that a Legend is quite often more awesome than the mundane reality that lies beneath it...

Available to Read, for Free! Fantasy Express #5. Go Back to 1983 - and meet Alan Moore in full, Read all about Countdown, And then there's Johnny Future...